Free psa crypto at the end of programs when initialized

Signed-off-by: Przemek Stekiel <przemyslaw.stekiel@mobica.com>
diff --git a/programs/x509/cert_app.c b/programs/x509/cert_app.c
index 07016e4..721de84 100644
--- a/programs/x509/cert_app.c
+++ b/programs/x509/cert_app.c
@@ -461,6 +461,7 @@
 #endif
     mbedtls_ctr_drbg_free(&ctr_drbg);
     mbedtls_entropy_free(&entropy);
+    mbedtls_psa_crypto_free();
 
 #if defined(_WIN32)
     mbedtls_printf("  + Press Enter to exit this program.\n");